摘要
目的朱墨时序检验一直是文件检验鉴定领域的疑难课题,研究偏振光显微镜在判断激光打印文件朱墨时序问题中的应用。方法使用LEICA DM12000 M显微镜,对实验样本的朱墨交叉部位进行检验,分析比较普通检验模式和偏振光检验模式下的样本观察效果,探讨偏振光检验模式下印泥与印油的先墨后朱和先朱后墨两种时序样本的显微特征。结果偏振光显微镜检验法对普通显微镜检验中难以观察到的印文色料形态分布特征具有较为明显的检验效果;先墨后朱和先朱后墨两种时序样本的偏振光显微观察特征有明显不同。结论偏振光显微镜观察是判断激光打印文件朱墨时序问题的一种无损、有效的新方法。
Objective The examination of the sequence of crossed stamp impression and printed text is always a difficult task in questioned document examination. This study aims at sequencing the crossed stamp impression and text printed by laser printer with polarized microscope. Method Using a LEICA DM12000 M microscope, the samples were observed by the normal and polarized light. The microscopic characteristics of the samples of two different sequences were analyzed comparatively. Results The polarized microscope has significant advantages on observing the morphological distribution characteristics of seal ink's pigments, which is hard to observe with ordinary microscopes. There were apparent differences in the characteristics between two kinds of samples. Conclusion The polarized microscope observation is a non-destructive and effective method to determine the sequence of crossed stamp impression and laser-printed text.
引文
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